diff --git a/test/FrontendC/2008-01-25-ByValReadNone.c b/test/FrontendC/2008-01-25-ByValReadNone.c
index 8ec60525af8..42e9c362629 100644
--- a/test/FrontendC/2008-01-25-ByValReadNone.c
+++ b/test/FrontendC/2008-01-25-ByValReadNone.c
@@ -10,6 +10,6 @@
 // temporary when inlining such a function, which is costly for
 // the common case in which the byval argument is not written.
 struct S { int A[1000]; };
-int __attribute__ ((const)) f(struct S x) { return x.A[0]; }
+int __attribute__ ((const)) f(struct S x) { x.A[1] = 0; return x.A[0]; }
 int g(struct S x) __attribute__ ((pure));
 int h(struct S x) { return g(x); }